Separate scaling cooldown by type

[ThomasObenaus]

Currently sokar's cooldown mechanism does not regard the direction if the scaling.
This means even though it is possible to configure different cooldowns for down- and up-scaling, it is not possible to directly scale up after a down-scaling.

Why?:

• Sokar just memorizes the timestamp for the last scale action, no matter if it is a down- or up-scaling.
• If configured differently sokar just waits longer/ less for the next down- / up-scaling event.
• But in each case sokar will wait for the next down-scaling even if there was only an up-scaling event beforehand.

With this ticket the down- and up-scaling cooldown should be really separated from one another.